Hello. I have cls 320cdi no dpf. Car runs fine but on heavy acerelation blows loads of black smoke .. same when car is parked and rev up 2.5k quick it blows black smoke ... No faults on diagnostic.. boost pipes is ok.. where could be problem ?
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134000k on clock 2009 regHi Savi. What year is the car , what mileage on the engine. What normal style of driving do you do , around town ? Short trips ? Motorway ? Does it always smoke when revved hard or has that just begun happening. A bit more detail will help .
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